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Due to the broad range of environmental factors causing abiotic stress and complex genotype-by-environment interactions, it is crucial to understand the genetic basis of crop yield under suboptimal conditions. Here, we developed a dent maize Multi-parent Advanced Generation Inter-Cross (MAGIC) population comprising 388 doubled-haploid (DH) lines. The population was derived from eight founders with varying stress tolerance, selected from a dent diversity panel evaluated for yield performance across a wide range of European environments. The MAGIC DH lines were genotyped via whole-genome sequencing (~\u20095\u00d7 coverage) and evaluated in seven testcross and 14 line per se trials, for grain yield, leaf senescence, leaf rolling, anthesis-silking interval, and six additional agronomic traits. Genetic dissection identified 22 grain yield QTL, explaining 45% of the genetic variance. Under heat and drought stress, testcross grain yield correlated significantly with leaf senescence and leaf rolling measured in line per se trials. Bivariate multi-trait analysis showed that alleles for delayed senescence and reduced rolling at detected QTL generally exhibited positive effects on grain yield, suggesting that accumulating these favorable alleles could enhance yield performance. Incorporating these proxies into multi-trait genomic prediction models improved yield prediction accuracy, although gains were constrained by modest trait correlations. Given the comprehensive data, we also provide recommendations for optimizing sequencing depth and QTL mapping strategies in experimental maize populations.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00122-026-05364-w","type":"journal-article","created":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T01:48:31Z","timestamp":1788400111000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Genetic dissection of grain yield and correlated proxy traits under suboptimal conditions"],"prefix":"10.1007","volume":"139","author":[{"ORCID":"https:\/\/orcid.org\/0009-0002-5215-4856","authenticated-orcid":false,"given":"Yan-Cheng","family":"Lin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0097-8901","authenticated-orcid":false,"given":"Claude","family":"Urbany","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-0505-7398","authenticated-orcid":false,"given":"Antonina","family":"Shlykova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1850-8876","authenticated-orcid":false,"given":"Armin C.","family":"H\u00f6lker","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3320-0888","authenticated-orcid":false,"given":"Milena","family":"Ouzunova","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4447-4350","authenticated-orcid":false,"given":"Thomas","family":"Presterl","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7874-8500","authenticated-orcid":false,"given":"Torsten","family":"Pook","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2687-8316","authenticated-orcid":false,"given":"Manfred","family":"Mayer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6729-3122","authenticated-orcid":false,"given":"Sebastian","family":"Urzinger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6067-7900","authenticated-orcid":false,"given":"Chris-Carolin","family":"Sch\u00f6n","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,9,3]]},"reference":[{"key":"5364_CR1","doi-asserted-by":"publisher","first-page":"305","DOI":"10.3389\/fphys.2012.00305","volume":"3","author":"JL Araus","year":"2012","unstructured":"Araus JL, Serret MD, Edmeades GO (2012) Phenotyping maize for adaptation to drought. 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